поlimited or one-time action+радto be glad (about), to rejoice+оваverb-forming suffix, often meaning “to perform or engage in [the base’s activity]”+тьInfinitive+сяreflexive marker
verbRare#44,851
rejoice, be happy
RU: Я очень рад возможности порадоваться вместе с вами.
EN: I’m very happy to be able to rejoice with you.